How to use Pry within Factory Girl Rails?

Question

In order to debug a factory I've inserted rescue binding.pry at the end of a problematic line:

after_create do |my_object, proxy|
  my_object.foreign_key_id = proxy.generated_attribute rescue binding.pry

Unfortunately, inside the resulting FactoryGirl::Declaration::Implicit context I can't seem to access the context like I would in "normal" code (NameError: undefined local variable or method `proxy' for #<FactoryGirl::Declaration::Implicit:0x0...>). How do I inspect and manipulate my_object and proxy within the Pry session?

The code is called as part of the background of a Cucumber feature:

Given the following my_objects exist:
| property |
| value    |

factory_girl_rails and factory_girl/step_definitions.rb are required by the support script.

Bloodroot

I think that callback block takes only one argument. Anyway you could move binding.pry form the rescue block, put it above the second line and see what happen. – Low

Could you tell us what exactly you're going to achieve? – Low

@luacassus: The repo has an example with two arguments. – Bloodroot

@luacassus: Putting binding.pry above the failing line makes no discernable difference - my_object still isn't available. – Bloodroot

Are you sure you're using Factory.create instead Factory.build or other method? – Low

It should be create - We're using the Cucumber helpers. – Bloodroot

Answer 1

In order to allow attribute names to define attributes without having a block argument, factory_girl evaluates the definition block using instance_eval and undefines most private methods on Object, including binding. That means that when you call binding.pry above, you're not calling pry on the binding for that block; instead, you're defining a new attribute with a name of "binding" and invoking pry on the created attribute definition.

You can get around this by using Kernel.binding.pry instead.

Sining

Thanks for this. This had been haunting me for a while now :) – Riotous

Just in case ppl are wondering, it works with byebug as well. Kernel.binding.byebug – Yesima